code: def _NextIterationGrad(_, grad):
      """A forward next_iteration is translated into a backprop identity.
  
      Note that the backprop next_iteration is added in switch grad.
      """
      return grad
  
file_path: tensorflow-upstream/tensorflow/python/ops/control_flow_grad.py
imports: from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import indexed_slices
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import tensor
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import control_flow_util
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops.control_flow_ops import *
label_desc: Use image node_id 5 for calling a global function with example usage: _NextIterationGrad(_, grad) and returns: grad